2 j 8 Anatyfts of the Air . 
Experiment CVIII. 
The following Experiment will Ihew, 
that the elafticity of the air is greatly dc- 
ftroyed by the refpiration of human Lungs , 
•viz. 
I made a bladder very fupple by wetting 
of it, and then cut off fo much of the neck 
as would make a hole wide enough for the 
biggeft end of a large foffet to enter, to 
which the bladder was bound faft. The 
bladder and foffet contained 74 cubicle 
inches. Having blown up the bladder, I 
put the fmall end of the foffet into my 
mouth 5 and at the fame time pinched my 
noftrils clofe that no air might pafs that 
way, fo that I could only breath to and fro 
the air contained in the bladder. In lefs 
than half a minute I found a confiderable 
difficulty in breathing, and was forced after 
that to fetch my breath very faft; and at 
the end of the minute, the fuffocating un~ 
eafinefs was fo great that I was forced to 
take away the bladder from my mouth. 
Towards the end of the minute the blad- 
M I 
dcr was become fo flaccid, that I could not 
blow it above half full with the greateft 
expiration that I could make : And at the 
fame 
